898125 divided by 81 
The aim is to understand the frequency of 81 in 898125.

Moving on to step 1:
If we divide 8 by 81, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 81

Going ahead to step 2:
If we divide 89 by 81, we get 1 and a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 81 from 89 leaves us with 8.
Include the next digit (8) from the dividend after 8, then repeat: 88 / 81

Step 3:
88 divided by 81 is 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtract 81 from 88 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 81

Let's proceed to step 4:
The number 81 fits into 71 0 times, leaving a remainder of 71.
Record the quotient 0 as the next digit in the result. 
Result so far: 110.0
Subtracting 0 from 71 leaves us with 71.
Take the next digit (2) from the dividend and append it to 71, then repeat: 712 / 81

Step 5:
81 goes into 712 8 times with a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 1108.0
If we take 648 away from 712, we end up with 64.
Append the next digit (5) from the dividend to 64 and continue with: 645 / 81

Advancing to step 6:
645 divided by 81 is 7 with a remainder of 78.
Put 7 as the next digit of the answer. 
Result so far: 11087.0
If we subtract 567 from 645, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 7:
81 goes into 780 9 times with a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 11087.9
Subtracting 729 from 780 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 8:
81 goes into 510 6 times with a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 11087.96
Deduct 486 from 510 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 9:
240 divided by 81 is 2 with a remainder of 78.
The number 2 becomes the next digit in our result. 
Result so far: 11087.962
Subtracting 162 from 240 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Going ahead to step 10:
81 goes into 780 9 times with a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 11087.9629
The remainder is 51 after subtracting 729 from 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

On to step 11:
81 goes into 510 6 times with a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 11087.96296
If we subtract 486 from 510, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 12:
81 can be fit into 240 2 times, resulting in a remainder of 78.
Put 2 as the next digit of the answer. 
Result so far: 11087.962962
Deduct 162 from 240 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 13:
If we divide 780 by 81, we get 9 and a remainder of 51.
Use 9 as the next digit of our solution. 
Result so far: 11087.9629629
If we subtract 729 from 780, we get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

On to step 14:
When dividing 510 by 81, we get 6 with a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 11087.96296296
If we take 486 away from 510, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final outcome is 11087.96296296, with a leftover of 2.4e-08.